The survey by career website Glassdoor asked U.S.-based employees to rate how satisfied they are with their company overall, as well as key workplace factors like career opportunities, compensation and benefits, culture and values. The survey was conducted online and on an anonymous basis. Companies were graded on a scale of 1 to 5 - with 5 representing the highest level of satisfaction.

""We are incredibly proud to be named the #1 Best Place to Work," said Russ Hagey, Global Chief Talent Officer at Bain & Company- which scored 4.6.

"For more than 40 years, we have placed significant focus on creating an outstanding professional and personal work experience that in turn has fueled our growth anchored in a mission of delivering results for clients and organizations around the globe," Hagey said.

"The people are fantastic, the work is challenging and the environment is a lot of fun. The perks are a lot of fun. The culture is very open which makes the experience very positive," a Google employee wrote on the Glassdoor site.

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